I have a 4.6L Mustang GT 1998 with the T45.Question: The Mustang has 150,000 miles on it and the T45 is not shifting very smooth. I would like information on a rebuild kit.Answer:  Based on our experience the problem you describe with the T45 5 speed  is typically caused by bearing and syncro ring wear.We recommend the following parts to overhaul your T45 transmission:

• Bearing Rebuild kit T45 with 4.6L engine order our part number MWT-250WS your cost $370.87 plus S&H.

This kit will include syncro rings.If you find additional damaged parts once you get the unit open give us a call we can provide the parts you need.If you need additional information on the overhaul project give Scott a call 888-824-2012 he can help you.  You can see the other parts we can supply for your T45 on our site.